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This paper reports the author's effort to v e r i h some of the present assumptions regarding causes and relationships in the volatility of engine oil phosphorus. Using Selby-Noack volatility data froni 2300 engine oils collected by the Institute of Materials in three areas of the uiorld, volatilised phosphorus showed very low statistical dependence on either oil volatility or phosphorus concentration in the fresh oil. Rather, the data seeined to indicate that the chetilistries of the phosphorus-containing additives and their forniiilation ioith other additives 7uere the controlling cause of phosphorus volatility and, by extension, emission level.The study permitted the development of a phosphorus emission index that predicts the emission potential of a forniiilated oil based on the amount of phosphorus found in the volatilised oil collected in the Selby-Noack test.

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